Apparatus for telephone-lines.



C. D. ENOGHS. APPARATUS FOR TELEPNHONE LINES. APPLICATION PILEDTBB. 1, 1907.

Patented Mar. 15,1910.

5 'UNITED srarns raras@ oserei,

CLAUDE D. ENOCHS, F LA. CRQSSE, WISCONSIN, ASSGNOR T 'VOTE BERGER COMPANY, A. OREGRAION GF WISCONSIN.

" APPARATUS FOR TELEPHONE-LINES.

La Crosse, in the county of La Crosse and State of Wisconsin, have invented a new and useful Improvement in Apparatus tor l Telephone-Lines, of which the following is l a specification.d r

My invention relates to improvements in apparatus for telephone lines, and more particularly, although not exclusively to the operation of the supervisory circuit. in which the signal lamp is controlled automatically when the receiver at the subscribers station is hung up or taken down. In the system thus organized, signal lamps are connected in series with the windings of repeating coils in the supervisory circuit, and during conversation, the lines including the subscribers sets shunt out the lamps which are lighted when the subscribers hang up their receivers.

This invention4 is applicable to various forms of telephonecircuits in use and is shown applied to line circuits containing automatic ballasts.

The accompanying drawing, forming part of this specification is azdiagrainrnatic View of my invention in Which AWA" represent the usual sub-stations and 1 and 2 the lines leading to the central station where they terminate at the springs 3 and 4i of jacks C-C. It Will be understood that the spring jacks and the apparatus cooperating' therewith are similar in construction and this description is equally applicable to either one or the other of the snbscrilxars circuits, described. The .lines 1 and 2 in clude a loop DV containing in series the line battery G, impedance coils 7 and 8, line signal lamp 10 and an automatic ballast 11 such a's described in my Patent No. 854,203

ranted May 21st, 1907. A branch 9 of this oop is connected with the sleeve 12 of the jack.

The supervisory or cord plug circuitF is provided with lines 15 and 16 the terminals of each being connected one with the tip l17 and the other with the ring 18 respectively of each lug E-EC The 'line 15 has con neeted t erewith Ain series the windings 19 and 20, of repeat-ing coils G and H and the line 16 also contains in series the windings 21 and 22 of said repeating coils. Between the windings in each line 15 and 16 are con- Spccication of Letters etent.

.ing the line signal iatented Bizar. 55'. i

Application filed February 1., 1907. Serial Eo. 355.21l.

nec-ted 'respnztively signal lampe Thering 1S of each plug i su'in to connect the spring with the when inserted in the jack, and is adapted to short circuit the signal lamp lo in the l when the supervisory circuit is in use. The battery feed for the transmitters ot is obtained from the saine source which on erates'the line signa-l lamps.

The operation of my s vsteni as described is as follows: Assuming that subs i desires to converse with sub. removes his receiver ironi the thereby closes his line circuit. His line l l0 at 'the central odi: will ilwreup illuminated by a current flowing t the lino from the batteriY t?. Upon pe the sunscribers operator whose telephone set and r ring key are not shown, inserts the answering plug in 'the jack C of the calling line and iis-certains the number wanted. As soon as the plug ii is inserted current fiovvs through the cord plug; circuit including the windings Bland i() ot the repeatilw coils G and L and the super visory signal lamp Q3, the line signal lamp 10 being short eircuited. The plug is then inserted in the jack C and ConnnuniA cation is established between the subscribers' sets throughthe repeating coils G and il. both supervisory lamps in the meantinw being shunted out, for the .resistance of the subseribers circuit is low enough includingv all practical lengths of lines, to prevent the lamps' from illuminating. lWhen the receiver at either of the stations is hung up, the supervisory signal lamp connected with said station is illuminated as 'the shunt' which affects the lamp is thus removed.v

ln accordance with the patent statutes, l have described the principle of operation oit my invention, together with the apparatus which I now consider to re resentthe best embodiment thereof, but I '.esire to have it understood that-.the apparatus shown is only illustrative and that the invention can be carried out by other means and applied to uses other than those above set forth.

Having described my invention, what l claini new and desire to protect by Let ters Patent is l. Apparatus for telephone lines, con prising, a cord plug circuit having" a Winding ot a` repeating coil and a signal lamp connected with said cord plug circuit and a subscribers circuit containing a subscribers set, a line jack connected with said sub- .scribers circuit having a sleeve, and a battery loopA connected with said line circuit containing a line lamp and having a branch thereof connected with the sleeve of said jack; whereby the lamp in the cord plug circuit isvshunted outand the line lamp in the lool of the subscribers circuit cut out when tie receiver of the subscribers set is taken off of its hook and the cord plug inserted in the jack, and the signal lamp in the cord plug circuit illuminated when the receiver of the subsc'ribers set is hung upon its hook.

2. A telephone circuit including a subscribers line jack, a cord plug circuit, a signal lanip in said cord circuit, a repeater having its windings connected with said cord circuit, a source of current supply conuected with said line, and asignal lamp and ballast; connected With'said current supply and the ring of said jack, for the purposes specified.

3. A telephone s stem, including a line circuit` a subscriber s set, a line jack, a cord plug circuit containing a winding of aire,- pcating coil-and a signal lamp and a batterjr oop connected with said line circuit and containing a line lamp and ballast and a branch thereof being connected with an independent terminal of said line jack, for the purposes specified.

In testimony whereof, l have signed my name to this specification. in thepresence of two subscribing witnesses.

CLAUDE 1). mooi-Is.

Witnesses:

' E. C. BREWER,

(l. GUNnoUN. 

